scholarly journals Design and Simulation of an Isolated Seven Level Three Phase Inverter

2021 ◽  
Vol 9 (8) ◽  
pp. 1458-1462
Author(s):  
Debadyuti Banerjee
Keyword(s):  
Output Voltage ◽  
Pulse Width Modulation ◽  
Reference Signal ◽  
Signal Frequency ◽  
Isolation System ◽  
Phase Inverter ◽  
Three Phase ◽  
Control Scheme ◽  
Multi Level ◽  
Three Phase Inverter

Abstract: This paper proposes a seven level three phase inverter with PWM control scheme for better performance and magnitude control of output voltage. This proposed inverter offers a proper isolation between load and inverter circuit and different phases also. This inverter is capable of generating waveforms independently for different phases. By changing the reference signal frequency output frequency can be changed which is capable to make the system of variable frequency. Use of reverse voltage topology has increased the magnitude of output voltage. Proper application of diode makes the unidirectional switch bidirectional and decreases the number of switches. Keywords: Pulse width modulation, multi-level topology, bi-directional switches, isolation system

scholarly journals Modified T-type topology of three-phase multi-level inverter for photovoltaic systems

2022 ◽  
Vol 12 (1) ◽  
pp. 262
Author(s):  
Abderrahmane Ouchatti ◽  
Redouane Majdoul ◽  
Ahmed Moutabir ◽  
Abderrahim Taouni ◽  
Abdelouahed Touati
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Phase Inverter ◽  
Three Phase ◽  
Control Scheme ◽  
Flying Capacitors ◽  
Multi Level ◽  
The One ◽  
Output Filter ◽  
Three Phase Inverter

In this article, a three-phase multilevel neutral-point-clamped inverter with a modified t-type structure of switches is proposed. A pulse width modulation (PWM) scheme of the proposed inverter is also developed. The proposed topology of the multilevel inverter has the advantage of being simple, on the one hand since it does contain only semiconductors in reduced number (corresponding to the number of required voltage levels), and no other components such as switching or flying capacitors, and on the other hand, the control scheme is much simpler and more suitable for variable frequency and voltage control. The performances of this inverter are analyzed through simulations carried out in the MATLAB/Simulink environment on a three-phase inverter with 9 levels. In all simulations, the proposed topology is connected with R-load or RL-load without any output filter.

scholarly journals Digital control strategy for SPWM MPPT of PV system with three-phase NPC three-level converter

2020 ◽  
Vol 19 (2) ◽  
pp. 572
Author(s):  
Mahmoud Aref ◽  
Ismaiel Ahmed ◽  
Vladislav Oboskalov
Keyword(s):  
Digital Control ◽  
Output Voltage ◽  
Maximum Power ◽  
Pv System ◽  
Lcl Filter ◽  
Phase Inverter ◽  
Three Phase ◽  
Multi Level ◽  
Level Converter ◽  
Three Phase Inverter

<p><span>This paper is aimed at investigating MPPT of PV system controlled by SPWM which is generated by comparing sinusoidal wave with variable frequency sawtooth wave. Perturb and Observe (P&amp;O) method is used for MPPT control of PV system. NPC three-phase three-level converter with LCL filter is designed to produce output voltage with minimum Total Harmonic Distortion (THD) and high efficiency. The simple and fast method to get MPP of PV system with variable irradiation is digital control where the maximum power point is obtained from look-up table for the values of optimum voltage that achieve the maximum power for each irradiance value is used for digital control signal in microcontroller. The output voltage harmonic of multi-level three-phase inverter is controlled using SPWM control. THD of output voltage of multi-level three-phase inverter is 22% of stand-alone and grid-connected PV system. Small rate LCL filter is used to limit voltage harmonics within medium and low voltage limits (5%). THD output voltage of LCL filter is 4.9% and 3.51% of stand-alone and grid-connected PV system respectively. </span></p>

scholarly journals Three Phase 9-Level Hybridised Cascaded Multi-Level Inverter for Use in Smart Grid

2019 ◽  
Vol 8 (10) ◽  
pp. 4612-4618
Keyword(s):  
Smart Grid ◽  
Pulse Width Modulation ◽  
Modulation Scheme ◽  
Fast Fourier Transform Analysis ◽  
Three Phase ◽  
Multi Level ◽  
Grid Operation ◽  
Inverter Topology ◽  
Three Phase Inverter ◽  
Smart Grid Technology

Smart grid technology can be best utilized by having proper grid supporting equipment. This paper demonstrates the use of a three-phase, 9-level, hybridised cascaded multi-level inverter topology in a smart grid. A pulse width modulation scheme with phase disposition is employed in this inverter to control the firing signals to operate this circuit. These firing signals can be monitored and controlled for optimal usage in smart grid operation. Operational principles with switching equations are described in detail. Crucial voltage identification has been performed by analyzing the THD in output during source shortages by performing Fast Fourier transform analysis. Least THD of 15.82% is attained in the output voltage waveform of the proposed three phase inverter topology.

scholarly journals Influence of PWM Methods on Semiconductor Losses and Thermal Cycling of 15-kVA Three-Phase SiC Inverter for Aircraft Applications

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 620 ◽  
Author(s):  
Bernardo Cougo ◽  
Lenin Morais ◽  
Gilles Segond ◽  
Raphael Riva ◽  
Hoan Tran Duc
Keyword(s):  
Thermal Cycling ◽  
Thermal Stresses ◽  
Pulse Width Modulation ◽  
Junction Temperature ◽  
Phase Inverter ◽  
Instantaneous Power ◽  
Power Modules ◽  
Temperature Swing ◽  
Three Phase ◽  
Three Phase Inverter

This paper presents the influence of different pulse width modulation (PWM) methods on losses and thermal stresses in SiC power modules used in a three-phase inverter. The variation of PWM methods directly impacts instantaneous losses on these semiconductors, consequently resulting in junction temperature swing at the fundamental frequency of the converter’s output current. This thermal cycling can significantly reduce the lifetime of these components. In order to determine semiconductor losses, one needs to characterize SiC devices to calculate the instantaneous power. The characterization methodology of the devices, the calculation of instantaneous power and temperature of SiC dies, and the influence of the different PWM methods are presented. A 15-kVA inverter is built in order to obtain experimental results to confirm the characterization and loss calculation, and we show the best PWM methods to increase efficiency and reliability of the three-phase inverter for specific aircraft applications.

scholarly journals A new simplified SVPWM algorithm based on modified carrier signal

2011 ◽  
Vol 22 (5) ◽  
pp. 545-557 ◽  
Author(s):  
Raymundo Cordero Garcia ◽  
João Onofre Pereira Pinto
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Experimental Results ◽  
Phase Inverter ◽  
Switching Patterns ◽  
Three Phase ◽  
Execution Speed ◽  
Simplified Algorithm ◽  
Mathematical Operations ◽  
Three Phase Inverter

This paper presents a simplified algorithm of space vector pulse width modulation (SVPWM) for a two-level three-phase inverter, which can operate in undermodulation and overmodulation modes. In other simplifications founded in literature, the reference voltages are modified and compared with a triangular carrier to estimate the switching states of the inverter. However, this paper proposes the modification of the carrier signal instead of the references. This procedure reduces the number of mathematical operations and increases the execution speed of SVPWM algorithm in DSPs or FPGAs. The reference voltages are sinusoidal, even for overmodulation mode. Simulation and experimental results proves that the proposed simplification produces the same switching patterns than conventional SVPWM, is simpler and is faster than other simplifications.

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